Spool for electrical coils



jan. 933. 1*-1 STQLP 395,;527@

sPooL FOR ELECTRIC CoILs Filed may 8, 1.951

/N VEN TOP f2? mi P A TTOP/VEV Patented Jan. 31, 1933 UNITED STATES.

PATENT OFFICE FRANZ STOLP, F BERLIN-PANKO'W, G-ER-IMIAIN'Y, ASSIGNOBTO'SIEMENS AITD HALSKE AKTIENGESELLSCHAFT, 0F SIEMENSSTADT NEAR BERLIN,GERMANY, A COMPANY OF GERMAN Y SPOOL FOR ELECTRICAL COILS Applicationled Hay 8, 1931, Serial No.

The invention relates to spools for elec trical coils which aresubstantially so assembled from individual parts without gummingl orpressing that the spools are stable in t emselves whereby a coil supportpart can be formed as a terminal block.

Methods hitherto known consisted of a member carrying the windinfr forinstance of' prismatic. form, notched at the' top and bottom and bentover and provided with a iange by gumming or pressing.A The manufactureof' spools of this kind necessitated various operations and specialmachines and was frequently very difficult just according to the natureof the manufacturing material. The

manufacturing costs of such spools were consequently comparatively high.Particular diiculties were met with in the manufacture of spools capableof withstanding the tropics and high tension which in order to complywith atmospheric. or voltage conditions had to be. manufactured frombakelite-hard paper which did allow the separate parts sticking togetheror if so only under excepv tional conditions. Spools of this type mostlyconsisted of moulded insulation or a metallic member provided withbakelite-hard paper flanges and covered with insulating paper or rubber.

In accordance with the invention these defects are removed and themanufacturing costs reduced in this way that the spools are assembledfrom a plurality of fiat blanks which yield stable members withoutgumming or pressing operations. Since the spools are assembledimmediately prior to winding which is done in a few moments and istherefore not to be considered as a special operation the manufacturingcosts are limited solely to material and stamping costs. Bakelitehardpaper can also be employed as manufacturing material for the methodaccording lto the invention and spools capable of resisting the tropicsand high tension can thus 45 be manufactured without diiculty. In re-535,830, and in Germany June 7, 1930.

spect to methods hitherto employed these spools not only stand out owingto their low manufacturing costs but also owing to considerablyincreased reliability of operation. A further simplification in respectto methods hitherto known is accomplished in this way that a part of thecoilsupport can be formed as a terminal block whereby a specialconnecting strip and the fixing means necessary for same are dispensedwith.

In the drawing which shows spools of' prismatic form, v

Fig. l is an end elevational view of a completed spool;

Fig. 2 is a side View of the spool shown 'in Fig. l;

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Fig. 3 is a top plan view of one embodi i ment of the invention showinga spool equipped with shelves having terminals supported thereon;

Fig. 4 is an end elevational view of another embodiment of the inventionin which a wound prismatic member is supported between upper and lowerstamped out flat parts; and y Figs. 5, 6 and 7 are' flat surface viewsof the stamped out parts necessary to form the spools shown in Figs. 1and 2, Figs. 5 and 6 being the fiat sides, two of each of which arerequired to form the prismatie barrel of the spool and Fig. 7 being oneof the spoolheads. The small apertures shown across the top of thespoolhead in Fig. 7 are provided for the accommodation of ends of coilwindings to be supported on the spool.

In one embodiment of this inventions namely that which is illustrated byFigs. l andvQ, two flat blanks a and a of the form shown in Fig. 5 eachprovided with hollows b and b formed in edge portions of the blank andextensions o and c extending from ends of the blank are placeddiagonally through an aperture d of two anges e, e of the form shown inFig. 7 and so arranged that the blank a lies against the edge A and theblank a against edge B of both flanges. Ilhe extensions c and c of eachof the parts a and a project beyond and normal to the outer faces of theanges e and e', respec- 5 tively, the part a resting on the edges A ofthe anges e and e' and the part a resting on the edges B of the langeseand e. The side parts of the coil carrier still lacking and necessary toform the prismatic barrel of the m spool are formed by two rectangularparts and f each provided with a tooth g on their sides as shown in Fig.6.

rlhese side parts ,f and f are so arranged that shifting into the angese and e is again l5 carried out -diagonally and the teeth are thenpressed into the hollows or b o part' a and and b of part a. The resultis a box-like structure provided with ianges such as shown in Figs. and2. Shifting of the 2@ angesinwardly is prevented by a strip ofsuiciently strong insulating paper which serves at the same time as awinding support.

lf the spool is to be provided with lterminals the part a which rests onthe edges A of both flanges is replaced by a part L whose extensionscorresponding to the extensions c, c of Fig. 5 are considerablyincreased to form comparatively wide shelves. These shelves are rovidedwith terminals or clamping pieces 'or terminations of ends of windingsto vbe supported on the spool and for attachment of wires of an outsidecircuit. Fig. 3 shows a spool constructed in this way.

Fig. 4 shows an end elevational view of a spool in which the side partsf, f of the form shown in Fig. 6 have been replaced by a wound prismaticmember z'. The wound pris- Leaders and beyond an end ange to form aterminal block.

5. A spool comprising spoolheads, a pair of spaced dat plate membersextending be-` tween sald spoolheads, and a prismatic member insertedbetween said spaced dat plate members, said prismatic member maintainingsaid plate members in spaced relationship and forming therewith aprismatic barrel for the spool.

ln witness whereof, l hereunto subscribe my name this 9th day of April,1931.

FRANZ STOLP.

matic member z' is inserted between the parts a and a and forms withthese parts a and a 40 the barrel of the spool. In this constructionalform it is not necessary to provide parts a and a with hollows b, b.

What is claimed is: 1. A spool for electrical coils comprising fourseparate Hat plates and two flanges and in which the four plates areheld together by the ianges.

2. A spool for electrical coils comprising a set of four separate iiatplates forming a and in which the plates are provided with teethengaging each other. p

3. A spool for electrical coils comprising a set of plates and endflanges, said plates having portions extending in the same plane as theplates and .normald tothe 4flat outer aces ofthe end flanges and bearingagainst the outer side of the flanges to hold said iianges and plates inassembled form.

4. A spool for electrical coils comprising individual fiat platesforming a prismatic coil carrier and end lian'ges therefor, one of theplates of said coil carrier having a por- 65 tion extending in the sameplane as the plate prismatic barrel of the spool, and end flanges

